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Towards using a focussed phased array of millimetre length scale elements for ultrasound imaging.

Abstract：

:Sparse phased array ultrasound transducers with millimetre length scale elements have previously been proposed for generating hyperthermia but not for imaging. Numerical simulation with a pseudospectral solver was used to investigate: (a) how the position of the maximum pressure in the focal region changed with element diameter and frequency; (b) how the size and position of the focal region changed with focal distance under steering; and (c) the imaging performance of 15 element random arrays. These analyses were performed for both piston-like and non piston-like millimetre diameter elements since previous work has shown a shift in the distance to the maximum pressure in the focal region with the latter. The results for these elements were compared with elements where the diameter was <λ/2. The distance from the array to the position of maximum pressure in the focal region diverged from the value with element diameter <λ/2; values for piston-like elements increased positively whilst values for non piston-like elements increased negatively. With distances expressed in λ, no difference was found for arrays at 1 MHz and 2.5 MHz. For piston-like elements, but not for non piston-like elements, two peaks were found in the focal region which were in-line with the direction of propagation for a focus on the central axis but which rotated to become parallel with the direction of propagation when steering exceeded 20°. The size and position of the focal region under steering was similar for the non piston-like elements and elements with diameter <λ/2. Little difference was found in image quality or the size of the point spread function (PSF) between images at 2.5 MHz with piston-like and non piston-like behaviour for steering angles less than 20° when compared with a linear array of similar size. These results suggest that imaging with random arrays of millimetre length scale elements is possible.

journal_name

Phys Med Biol

journal_title

Physics in medicine and biology

authors

Wilson AJ

doi

10.1088/1361-6560/aace07

subject

Has Abstract

pub_date

2018-07-16 00:00:00

pages

145009

issue

eissn

0031-9155

issn

1361-6560

journal_volume

pub_type

杂志文章

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Towards using a focussed phased array of millimetre length scale elements for ultrasound imaging.